+ 在哪里？在定义的电子邮件地址中？
我知道电子邮件地址的本地部分（@ 符号之前）可以包含 +。 + 之后的所有内容都可以被电子邮件系统用于过滤和其他用途。但电子邮件本身是按+号之前的部分发送的。
示例：
[email protected] Delivered to larry mailbox on foo.com
[email protected] Delivered to jim mailbox on foo.com
[email protected] Also delivered to larry mailbox on foo.com. The +1 can be
used for filtering or something else by the recipient
[email protected] Also delivered to larry mailbox on foo.com
以上适用于 GMail、Yahoo 和其他系统。
问题：RFC 中到底在哪里定义了它？我查看了但找不到它。
I know that email addresses, in the local part (before the @ sign), can include a +. And everything after the + can be used by the email system for filtering and other uses. But the email itself is delivered per the part before the + sign.
Example:
[email protected] Delivered to larry mailbox on foo.com
[email protected] Delivered to jim mailbox on foo.com
[email protected] Also delivered to larry mailbox on foo.com. The +1 can be
used for filtering or something else by the recipient
[email protected] Also delivered to larry mailbox on foo.com
The above works on GMail, Yahoo and other systems.
Question: Where exactly is it defined in the RFCs? I looked but couldn't find it.
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+ 未在用于邮件寻址的 RFC RFC 822 中定义。它是一些 MTA 的实现，旨在将传入的邮件过滤到单个邮箱，但当前的 RFC 不支持向发件人公开邮箱结构/过滤器。
它确实将地址本地部分的处理留给了 MTA，MTA 正是这些扩展的升级地点。
有一个提议的 RFC，RFC 5233，用于详细解释加寻址的子寻址。
因此，正在进行标准化工作，但这还没有发生。我知道并非所有 MTA 都使用 + 寻址来实现此目的。
The + isn't defined in the RFC for mail addressing, RFC 822. It is an implementation by some MTAs in an effort to filter incoming messages to a single mailbox, but the current RFC doesn't' support exposing mailbox structure/filters to senders.
It does leave the handling of the local portion of the address up to the MTA which is where these extensions have been promoted.
There is a proposed RFC, RFC 5233, for sub addressing that explains plus addressing in detail.
So there is ongoing work to standardize it, but that hasn't yet happened. I know not all MTAs use + addressing for this purpose.